Their wine didn't ferment, in the Merit of the Wine Libation in the Temple: Pesachim 42b
Their use of the term "Charufah" to describe a woman who was "Arusah" [in between Kiddushin and Nisuin]: Kiddushin 6a
Their care in learning with clear speech, in reviewing their learning, in learning from a single teacher and in getting to the bottom of the material they were learning: Eruvin 53a-b
Galil
Consumption of ordinary food with the purity of sanctified items in the Galil: Niddah 6b
Their lack of care in learning with clear speech, in reviewing their learning, in learning from a single teacher and in getting to the bottom of the material they were learning: Eruvin 53a-b
General Relations Between Them
Communication between the 2 regions: Ketuvot 17b-18a
The animals from Yehudah and Galil did not graze in each other's areas: Pesachim 52b
The stronger level of learning in Yehudah over Galil: Eruvin 53a-b
Specific Issues
Yehudah, Galil and the other side of the Jordan are considered separate areas, with their own subdivisions, regarding the time to destroy produce of the Sabbatical year: Pesachim 52b 3 years' Squatters' Rights on Territory in the different areas: Ketuvot 17b
What they meant when they used the terms "Cherem" or "Terumah" without elaboration [and with legal ramifications]: Nedarim 18b [2x], 19b
Walled Cities in Yehudah are considered permanent, for Acquisition of Mobile Items along with Territory: Bava Kama 12a
For customs of the Engagement Period: Ketuvot 7b, 9b, 12a
For customs of Eulogizing: Shabbat 153a
Doing work in the morning before Pesach: Pesachim 55a